Origin of improved visible photocatalytic activity of nitrogen/hydrogen codoped cubic In2O3: first-principles calculations
Literature Information
Honggang Sun, Weiliu Fan, Yanlu Li, Xiufeng Cheng, Pan Li, Jingcheng Hao, Xian Zhao
We have employed DFT calculations to carry out an accurate analysis of the effect of N- and NH-doping on the visible photocatalytic activity in the cubic In2O3. In the substitutional N-doped In2O3, the 2p impurity states of N induce a red shift in the optical absorption, while in the interstitial N-doping the red shift is dominantly caused by the localized π antibonding states of NO. When a H atom is accompanied by a N impurity in the lattice, the H atom acts as a charge donor and compensates the hole state created by N-doping, thus the energy level of the impurity states is reduced. As a result, the mixing of impurity states and the valence band is enhanced. At the same nitrogen dopant concentration, NH-codoping yields a larger band gap narrowing, especially for the interstitial NH-codoping. The theoretical calculations presented in this work explain well the previous experimental results of the enhanced visible photocatalytic activity in NH-codoped cubic In2O3.
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